Mixed Convection and Entropy Generation in a Double-Pipe Heat Exchanger Using Hybrid Nanofluids and Helical Baffles. Noor J. Eng. Mang. Comp. Sc. [Internet]. 2026 Sep. 8 [cited 2026 Sep. 8];2(4):224-32. Available from: https://njemcs.edu.iq/index.php/njemcs/article/view/165